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I am looking for some information on how to prevent porous cup samplers from freezing over the winter months. The porous cups are installed to a depth of 1 meter and the frost line is at 1.2 meters. The catch is I am using bromide as a tracer so I need a technique that will not interfere with analyzing for the bromide in my solution. I will not be sampling over the winter months. Any ideas will help? I am not yet a member, so please respond to my personal email address: jrsamuel@students.wisc.edu Sincerely, John Samuelson University of Wisconsin-Madison Soil Science Department Work: (608) 262-0415 jrsamuel@students.wisc.edu